Fix syntax error

app.py

@@ -19,7 +19,7 @@ def my_cutom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     return "What magic will you build ?"
 
 @tool
-def fetch_binance_price(symbol: str = "BTCUSDT") -> str
+def fetch_binance_price(symbol: str = "BTCUSDT") -> str:
     """Get price for a token from binance exchange
     Args:
         symbol (str): Trading pair symbol (e.g. 'BTCUSDT')